MB 7,1 Mid2010 corrupt nvram

Hi,

i have a bunch of MB7,1 mid 2010 Macbook with problems

Slow start, integrated keyboard and touchpad not responding until 10 minutes after boot.

from network access in system.log appears "cfgethostuuidstring unable to determine uuid for host. error 35"

Seems that reseting nvram and smc should recover them but ...

They have efi password, but i'm unable to change/clean since nvram command said "nvram not working on this platform".

I can't reset NVRAM using keyboard since is password protected.

Boot from install media and using Firmware password util is not working either.

Any magical recipe i can try before sending them to tech support.

Thanks